Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

include/scsi/scsi_cmnd.h

@@ -0,0 +1,165 @@
+#ifndef _SCSI_SCSI_CMND_H
+#define _SCSI_SCSI_CMND_H
+
+#include <linux/dma-mapping.h>
+#include <linux/list.h>
+#include <linux/types.h>
+
+struct request;
+struct scatterlist;
+struct scsi_device;
+struct scsi_request;
+
+
+/* embedded in scsi_cmnd */
+struct scsi_pointer {
+	char *ptr;		/* data pointer */
+	int this_residual;	/* left in this buffer */
+	struct scatterlist *buffer;	/* which buffer */
+	int buffers_residual;	/* how many buffers left */
+
+        dma_addr_t dma_handle;
+
+	volatile int Status;
+	volatile int Message;
+	volatile int have_data_in;
+	volatile int sent_command;
+	volatile int phase;
+};
+
+struct scsi_cmnd {
+	int     sc_magic;
+
+	struct scsi_device *device;
+	unsigned short state;
+	unsigned short owner;
+	struct scsi_request *sc_request;
+
+	struct list_head list;  /* scsi_cmnd participates in queue lists */
+
+	struct list_head eh_entry; /* entry for the host eh_cmd_q */
+	int eh_state;		/* Used for state tracking in error handlr */
+	int eh_eflags;		/* Used by error handlr */
+	void (*done) (struct scsi_cmnd *);	/* Mid-level done function */
+
+	/*
+	 * A SCSI Command is assigned a nonzero serial_number when internal_cmnd
+	 * passes it to the driver's queue command function.  The serial_number
+	 * is cleared when scsi_done is entered indicating that the command has
+	 * been completed.  If a timeout occurs, the serial number at the moment
+	 * of timeout is copied into serial_number_at_timeout.  By subsequently
+	 * comparing the serial_number and serial_number_at_timeout fields
+	 * during abort or reset processing, we can detect whether the command
+	 * has already completed.  This also detects cases where the command has
+	 * completed and the SCSI Command structure has already being reused
+	 * for another command, so that we can avoid incorrectly aborting or
+	 * resetting the new command.
+	 * The serial number is only unique per host.
+	 */
+	unsigned long serial_number;
+	unsigned long serial_number_at_timeout;
+
+	int retries;
+	int allowed;
+	int timeout_per_command;
+	int timeout_total;
+	int timeout;
+
+	/*
+	 * We handle the timeout differently if it happens when a reset, 
+	 * abort, etc are in process. 
+	 */
+	unsigned volatile char internal_timeout;
+
+	unsigned char cmd_len;
+	unsigned char old_cmd_len;
+	enum dma_data_direction sc_data_direction;
+	enum dma_data_direction sc_old_data_direction;
+
+	/* These elements define the operation we are about to perform */
+#define MAX_COMMAND_SIZE	16
+	unsigned char cmnd[MAX_COMMAND_SIZE];
+	unsigned request_bufflen;	/* Actual request size */
+
+	struct timer_list eh_timeout;	/* Used to time out the command. */
+	void *request_buffer;		/* Actual requested buffer */
+
+	/* These elements define the operation we ultimately want to perform */
+	unsigned char data_cmnd[MAX_COMMAND_SIZE];
+	unsigned short old_use_sg;	/* We save  use_sg here when requesting
+					 * sense info */
+	unsigned short use_sg;	/* Number of pieces of scatter-gather */
+	unsigned short sglist_len;	/* size of malloc'd scatter-gather list */
+	unsigned short abort_reason;	/* If the mid-level code requests an
+					 * abort, this is the reason. */
+	unsigned bufflen;	/* Size of data buffer */
+	void *buffer;		/* Data buffer */
+
+	unsigned underflow;	/* Return error if less than
+				   this amount is transferred */
+	unsigned old_underflow;	/* save underflow here when reusing the
+				 * command for error handling */
+
+	unsigned transfersize;	/* How much we are guaranteed to
+				   transfer with each SCSI transfer
+				   (ie, between disconnect / 
+				   reconnects.   Probably == sector
+				   size */
+
+	int resid;		/* Number of bytes requested to be
+				   transferred less actual number
+				   transferred (0 if not supported) */
+
+	struct request *request;	/* The command we are
+				   	   working on */
+
+#define SCSI_SENSE_BUFFERSIZE 	96
+	unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE];		/* obtained by REQUEST SENSE
+						 * when CHECK CONDITION is
+						 * received on original command 
+						 * (auto-sense) */
+
+	/* Low-level done function - can be used by low-level driver to point
+	 *        to completion function.  Not used by mid/upper level code. */
+	void (*scsi_done) (struct scsi_cmnd *);
+
+	/*
+	 * The following fields can be written to by the host specific code. 
+	 * Everything else should be left alone. 
+	 */
+	struct scsi_pointer SCp;	/* Scratchpad used by some host adapters */
+
+	unsigned char *host_scribble;	/* The host adapter is allowed to
+					   * call scsi_malloc and get some memory
+					   * and hang it here.     The host adapter
+					   * is also expected to call scsi_free
+					   * to release this memory.  (The memory
+					   * obtained by scsi_malloc is guaranteed
+					   * to be at an address < 16Mb). */
+
+	int result;		/* Status code from lower level driver */
+
+	unsigned char tag;	/* SCSI-II queued command tag */
+	unsigned long pid;	/* Process ID, starts at 0. Unique per host. */
+};
+
+/*
+ * These are the values that scsi_cmd->state can take.
+ */
+#define SCSI_STATE_TIMEOUT         0x1000
+#define SCSI_STATE_FINISHED        0x1001
+#define SCSI_STATE_FAILED          0x1002
+#define SCSI_STATE_QUEUED          0x1003
+#define SCSI_STATE_UNUSED          0x1006
+#define SCSI_STATE_DISCONNECTING   0x1008
+#define SCSI_STATE_INITIALIZING    0x1009
+#define SCSI_STATE_BHQUEUE         0x100a
+#define SCSI_STATE_MLQUEUE         0x100b
+
+
+extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, int);
+extern void scsi_put_command(struct scsi_cmnd *);
+extern void scsi_io_completion(struct scsi_cmnd *, unsigned int, unsigned int);
+extern void scsi_finish_command(struct scsi_cmnd *cmd);
+
+#endif /* _SCSI_SCSI_CMND_H */